Prime-mover dynamo plants – Starting and generating dynamo
Patent
1974-08-30
1976-02-10
Schaefer, Robert K.
Prime-mover dynamo plants
Starting and generating dynamo
290 38R, 60 3914, 318138, F02N 1104, H02K 2352, H02P 904
Patent
active
039379744
ABSTRACT:
The instant invention describes an improvement in a starter-generator arrangement in which a dynamoelectric machine is driven as a brushless DC motor to start a dynamic load such as a jet engine and as a cynchronous constant frequency generator after the jet engine is ignited and brought up to speed. A plurality of cycloconverters utilizing phase controlled rectifier banks are operated from a constant frequency supply source to supply current to the armature windings of the machine in the starting mode. Position sensing elements such as Hall generators sense the rotor position relative to the machine windings and generate enabling signals to control conduction of the phase controlled rectifiers to supply current to the proper armature windings so that the machine functions essentially as a DC brushless motor to drive a dynamic load such as a jet engine. The Hall sensors are so positioned that the enabling signals are generated so that stator current conduction in one winding may be terminated and current conduction switched to the next winding in such a fashion that commutation of the conducting SCR's by the machine counter EMF is made possible at high speeds while permitting maximum torque at standstill and low speeds. The stator current conduction angle with respect to the rotor position is varied as a function of speed. By varying the position sense advance and hence, the phase angle between the armature current and the machine voltage, maximum torque may be produced at the low speeds and maximum current may be commutated at the speeds where the machine voltage must be utilized to commutate the SCR's to transfer current flow from one winding to the other. The cranking time of an engine is thus substantially reduced since at low speeds, maximum torque is developed from the machine.
REFERENCES:
patent: 3264482 (1966-08-01), Clark et al.
patent: 3696278 (1972-10-01), Kuniyoshi
patent: 3781615 (1973-12-01), Mokvytzki
patent: 3784888 (1974-01-01), Geiersbach
patent: 3786327 (1974-01-01), Dyer
General Electric Company
Redman John W.
Schaefer Robert K.
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